Comment # 4 on bug 940186 from Heribert Schorn

The device is not under /dev/disk/by-id listed,

the device is there as  

ata-WDC_WD5000AADS-00S9B0_WD-WCAV9E336410-part2 -> ../../sda2

or 

ata-WDC_WD5000AAKS-00WWPA0_WD-WCAYU5909725-part2 -> ../../sdb2


what is correct as this device is in fstab:
....
/dev/disk/by-id/ata-WDC_WD5000AADS-00S9B0_WD-WCAV9E336410-part2    /boot   
ext2    acl,user_xattr 1 2 

and the system is booting well